RustyRatRod said

Check the number on the edge of the block just behind and under the alternator. It sticks out from under the head there like a shelf. There are a series of numbers there something like RG225 *** *** That can tell you what it is and the year model.

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townsend said

It's possible the carb is not original but the parts catalog shows it was only used in 1981 and 1982. The definitive answer would be to follow RustyRatRod's advice in post #5. You may have to pull the alternator off, if the stamped id number has been painted over or covered with dirt.

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